[Spring Design] The gate roller with an integrated spring design allows the gate wheel to roll over uneven or rough surfaces, reducing stress on the gate hardware, slowing the aging of the spring and extending the life of the gate.hinges [Self-Adjust Vertical] Adjustable spring-loaded bracket with spring-loaded vertical travel up to 1.75' automatically adjusts the height of the door to the surrounding ground during the opening and closing cycle, also effectively prevents the door from falling and keepsthe door roller level with the fence line.[Durable Construction and with Brake] The 4" diameter spring-loaded door wheel is made of thickened steel plate and double ball bearings, which has a strong load-bearing capacity of up to 100kg for each door wheel.brings.Easy opening and closing with wide, heavy gates.The brake is equipped for better control.[360° Rotating Wheels] The hard rubber door wheel is suitable for all terrains such as asphalt, brick, concrete, earth, rock #39;grass, gravel.It easily converts to any direction and allows you to use little force to safely move or stop the gate.[Easy Installation] With the heavy-duty 3-hole universal mounting plate, the gate bracket easily attaches to wooden gates or attaches along the horizontal or vertical rails of a farm tubular gate.Mounting screws and bolts are included